Superconductivity and physical properties of strongly electron correlated compounds LanRu3n−1B2n (n = 1, 2, and 3)
Frontier Research Center, Tokyo Institute of Technology - Yokohama 226-8503, Japan
Received: 26 September 2013
Accepted: 4 October 2013
We examined the physical properties of homologous LanRu3n−1B2n (n = 1−3) series including a new compound of n = 2. All of these compounds showed strong electron-electron correlation characterized by large Wilson ratio. In contrast to LaRu2B2 and La2Ru5B4 that show normal metal behaviors down to 1.8 K, we discover La3Ru8B6 is an intermediately coupled BCS superconductor with . The experimental and theoretical calculation results suggest that the emergence of superconductivity in La3Ru8B6 can be attributed to the rather large density of states at EF when compared to other two compounds.
PACS: 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.10.+v – Occurrence, potential candidates / 74.25.-q – Properties of superconductors
© EPLA, 2013